You can also use it for security, or more specifically, you can use your old Android phone as a home security camera.

Take RAW photos on other Android phones If your Android phone doesn't support RAW mode in the preinstalled camera app, you must use a third-party camera app to complete the job.

This Android camera app alternative is way better than what you're using I've tried many camera apps, and this one has the best feature-to-cost ratio on the Google Play Store.